STMicroelectronics HCF4532M013TR

Overview

HCF4532M013TR from STMicroelectronics is an 8-bit priority encoder IC that converts the highest active input among D7–D0 into a 3-bit binary code (Q2–Q0), with group select (GS) and enable output (EO) for cascading. It operates from 3 V to 20 V, delivers ±1.36 mA output drive at VDD = 5 V, and features 100 nA max input leakage at 18 V. Used in keyboard encoding and interrupt prioritization circuits.

For engineers reviewing the HCF4532M013TR datasheet, HCF4532M013TR pinout, HCF4532M013TR application, or HCF4532M013TR equivalent, key selection criteria include supply voltage range (3–20 V), propagation delay (220 ns max at 5 V), cascading capability via EI/EO/GS, and SOP-16 package compatibility with legacy 4000B-series logic designs.

Technical Context

The HCF4532M013TR implements combinational priority encoding logic where D7 holds highest priority and D0 lowest. Encoding occurs only when chip enable (EI) is high; otherwise all outputs are forced low except EO, which goes high when no inputs are asserted.

It supports multi-stage expansion via EO (active-low enable out) and GS (active-high group select), enabling construction of 16-input or larger encoders. Output drive strength and noise margins scale with VDD: VOH ≥ 4.95 V at 5 V, VOL ≤ 0.05 V, with 1 V min noise margin at 5 V.

Key Specifications

Pinout & Package

SOP-16 package (SO-16, 3.9 mm body width, 1.27 mm pitch), compliant with JEDEC MS-012, tape-and-reel format per order code M013TR.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar priority encoder applications.

Compared with CD4532BE and 74HC148PW, the HCF4532M013TR uniquely supports 20 V operation and retains full 4000B-series noise margins, making it the only option for industrial 15 V backplanes or mixed-supply systems where voltage headroom and noise immunity are non-negotiable.

Availability

HCF4532M013TR is available at Aetrix Electronics and suitable for keyboard interfaces, interrupt prioritization circuits, industrial control panels, and legacy system upgrades requiring stable component supply across extended temperature and voltage ranges.

Supply support for HCF4532M013TR includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

STMicroelectronics is a global semiconductor leader headquartered in Geneva, designing and manufacturing microcontrollers, power management ICs, sensors, and analog components for industrial, automotive, and consumer markets.

The HCF4532B series belongs to ST's legacy CMOS logic portfolio, engineered for drop-in replacement of industry-standard 4000B-series encoders with enhanced electrical specifications and extended temperature qualification.

FAQ

What is the function of the EO (Enable Output) pin?

The EO pin is an active-low cascading signal that goes low when any D7–D0 input is high, disabling lower-priority encoder stages in multi-chip configurations. When all inputs are low and EI is high, EO goes high to indicate no active priority request - enabling upstream encoders to respond.

Does HCF4532M013TR require external pull-up or pull-down resistors on inputs?

Yes - the D7–D0 inputs have no internal termination. External pull-down resistors (typically 10–100 kΩ to VSS) are required to ensure defined logic-low states when switches or open-collector sources are used, preventing false triggering due to floating inputs.

Can HCF4532M013TR operate at 3.3 V?

No - the minimum recommended VDD is 3 V, but DC specifications (VIH/VIL, VOH/VOL, noise margin) are only guaranteed down to 5 V per Table 4. At 3.3 V, functionality is not assured; use 74HC148 or 74LVC148 for true 3.3 V operation.

Is HCF4532M013TR still in active production?

While marked "Obsolete Product(s)" in the 2004 datasheet revision, HCF4532M013TR remains available through authorized STMicroelectronics distributors and Aetrix Electronics' long-term inventory program, with full traceability and compliance documentation for legacy design support.